Improvement in harrow-teeth



E. ,R. WHITNEY, Harrow-Tooth.

No.211,819. Patented Jan. 28,1879.

IJVV' ,TOR 6404MB MFETERS. 'PHOTO-UTHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT FFICE.

EDWVIN R. WVHITNEY, OF MONTREAL, CANADA, ASSIGNOR OF ONE-FOURTH HISRIGHT TO CHAS. L. BOSSE, OF SAME PLACE.

IMPROVEMENT IN HARROW-TEETH.

Specification forming part of Letters Patent No. 21] .819, dated January28, 1879;- application filed June 28, 1878.

To all whom it may concern:

Be it known that I, EDWIN R. WHITNEY, of Montreal, in the Dominion ofCanada, have invented certain new and useful Improvements inHarrow-Teeth; and do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, making a partof this specification.

My invention consists in aharrow-tooth having a steel center, so that itforms a self-sharpening tooth, as hereinafter more fully set forth.

In the accompanying drawings, making a part of this specification,Figure 1 represents a side view of a tooth; and Fig. 2, a crosssectionof the same, taken through linew a, Fig. 1.

The tooth is formed of three pieces of metal. The center piece, I), isof steel, while the two pieces a a, at each side of the same, are ofiron or other soft metal. The parts are rolled together, and may or maynot be provided with a head, (Z. In some cases a screw-tenon may beformed at the top instead of the head. The tooth may be of anypreferable shape, and can be used either as a harrow or cultivatortooth. The steel center is about one-third the thickness of the tooth,and when in use the iron or other soft metal will wear away and formaself-sharpening tooth. The metal may be rolled in long bars and cut inlengths to suit, and then formed with a point, I), on-the end.

Having thus fully described my invention, what I claim is- A harrow orcultivator tooth formed with a central steel section, b, and two sidebars or pieces, a a, of softer metal, for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand this15th day of May, 1878.

E. R. WHITNEY. \Vitnesses: ANDREW J. SIMrsoN,

ANGUS MCKAY.

